Özet:

The soil is a natural reservoir and a transporter component of the terrestrial ecosystem for polychlorinated biphenyls (PCBs). The determination of PCBs is important to identify the necessary precautious steps to be taken. The objective of this study is to determine seasonal and regional PCB variations in the soil in Bursa-Turkey. In this context, soil samples were collected from 19 different points during summer and winter seasons and analyzed by gas chromatography-electron capture detector (GC-ECD) for S82 PCB. The regional variation of S82 PCB concentrations was 0.03-85 ng/g dry matter (DM). The highest S82 PCB concentration was measured sampling points near the iron-steel plant in both seasons. At all sampling points, S82 PCB concentrations were higher in winter than those in summer. In general, high-chlorinated homologes groups (>6-CBs) in summer and low-chlorinated homologes groups (<5-CBs) dominated in winter. Also, a significant correlation was found between the heavy species (>5-CBs) and TOC, while no significant correlation was observed between the light species (<5-CBs) and TOC. The S7 PCB range of winter and summer seasons is 0.043-3.87 ng/g DM and 0.02-1.97 ng/g DM, respectively. The average Dutch S7 PCB concentration in winter was 0.735 ± 1.05 ng/g DM, while in summer it was 0.462 ± 0.72 ng/g DM.

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